400247420 has 12 divisors (see below), whose sum is σ = 840519624. Its totient is φ = 160098960.

The previous prime is 400247411. The next prime is 400247423. The reversal of 400247420 is 24742004.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400247423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10006166 + ... + 10006205.

It is an arithmetic number, because the mean of its divisors is an integer number (70043302).

Almost surely, 2^400247420 is an apocalyptic number.

It is an amenable number.

400247420 is an abundant number, since it is smaller than the sum of its proper divisors (440272204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400247420 is a wasteful number, since it uses less digits than its factorization.

400247420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20012380 (or 20012378 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 23.

The square root of 400247420 is about 20006.1845437855. The cubic root of 400247420 is about 736.9581855949.

Adding to 400247420 its reverse (24742004), we get a palindrome (424989424).

The spelling of 400247420 in words is "four hundred million, two hundred forty-seven thousand, four hundred twenty".